What is chessus?
chessus is a Claude Code mod by walangstudio that play chess against Claude inside Claude Code: pick the model and effort, review every game move by move. It is listed under Games and has no public popularity data yet.
| Type | Claude code mod |
|---|---|
| Author | walangstudio |
| Repository | walangstudio/chessus |
| Popularity | no public popularity data yet |
| Category | Games |
| Security | Review before installing (64/100) |
| Rank | #5,102 of 5,272 Claude Code mods; #104 in Games |
| Last commit | 2026-10-08 |
| Hooks | 4 events |
| Sees | only the events it hooks |
| Draws on | Pane |
Is chessus safe to install?
chessus scores 64/100 on the MCPMods security check: Review before installing. Things to review: sends data over the network; writes files or config. It passed 3 of 8 checks.
Mod footprints come from claude plugin validate, which lists every event a mod hooks and every API call it makes without running it.
| Check | Result |
|---|---|
| Sends data over the network | Review |
| Starts no processes | Pass |
| Writes files or config | Review |
| Doesn't read environment variables | Pass |
| Only sees the events it hooks | Pass |
| Drives Claude (model calls, prompts) | Note |
| Validator reported problems | Note |
| No license detected | Note |
API calls in its code
| Call | What it means |
|---|---|
$.clock.after | |
$.clock.every | |
$.clock.now | |
$.clock.sleep | |
$.command.register | |
$.fs.read | reads files |
$.fs.write | writes files |
$.http.fetch | network requests |
$.model.complete | drives Claude |
$.settings.read | reads settings |
$.state.get | |
$.state.set | |
$.store.delete | keeps its own state |
$.store.get | keeps its own state |
$.store.set | keeps its own state |
$.ui.ask | draws interface |
$.ui.close | draws interface |
$.ui.copy | draws interface |
$.ui.invalidate | draws interface |
$.ui.open | draws interface |
$.ui.panes | draws interface |
$.ui.resolve | draws interface |
$.ui.toast | draws interface |
How do I install chessus?
- Check your Claude Code version. Mods need Claude Code 2.1.287 or later and are on by default.
claude --version
- Read its footprint. This lists every event it hooks and every API call it makes, without running it.
git clone https://github.com/walangstudio/chessus claude plugin validate ./chessus/.
- Install it. Run this in your terminal, then /reload-plugins in an open session.
git clone https://github.com/walangstudio/chessus && claude --plugin-dir ./chessus/.
Or ask Claude to set it up
Paste this into Claude Code and it installs chessus for you:
Install the "chessus" Claude Code mod from https://github.com/walangstudio/chessus. Run claude plugin validate on it first and show me what it can access before you enable it.